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no more than 0.485 second.
4.8.4.2.1 The maximum transfer delay component that
can be attributed to the AES or GES shall be 0.080 second for
each.
Note 1.- Fixed transfer delay components o f 0.285 second
and 0.040 second are allotted to RF propagation delay (worst
case path geometry) and vocoder frame emission delay respectively.
Allocating 0.040 second for vocoder frame emission
delay provides for worst case synchronization where the jirst
0.020 second vocoder speech frame is delayed by an additional
C channel interleaver block.
Note 2.- Total transfer delay for the AMS(R)S subnetwork
is dejined as the elapsed time cammencing at the instant that
speech is presented to the AES or GES and concluding at the
instant that the speech enters the interconnecting network of
the counterpart GES or AES. This delay includes vocoder
processing time, physical layer delay, RF propagation delay
and any other delays within the AMS(R)S subnetwork.
4.8.6 AMS(R)S circuit-mode procedures
The AMS(R)S circuit-mode procedures comprise the following
four functional areas:
a) For the AES circuit-mode services:
i) AES outgoing logic procedure (for airoriginations);
and
ii) AES incoming logic procedure (for groundoriginations).
b) For the GES circuit-mode services:
i) GES outgoing logic procedure (for groundoriginations);
and
ii) GES incoming logic procedure (for airoriginations).
4.8.6.1 AMS(R)S CIRCUIT-MODE
PROCEDURES
Note I.- It is assumed that an AMS(R)S circuit-mode
service procedure will encode or interpret the relevant
parameters of any CM-LIDU being transmitted or received
without speczfzcully stating the exact code values in the
procedures contained herein. Specific requirements for parameter
encoding can be found in the interworking telephony
events mapping requirements defined in Appendix 5 to
Chapter 4.
Note 2.- The term "C channel resources" includes all
required C channel hardware and sufJicient transmitter power
to maintain a C channel. a
The probability of misrouting caused by internal processing or
signalling errors within the GES shaIl not exceed 1 in lo6.
4.8.6.1.1 A,??S CIRCUIT-MODE LOGIC
Note.- Misrouting can occur if the GES misinterprets ( I )
the network-ID or ground address digits con,tained in an
"abbreviated access request - telephone" CM-LlDU (for airorigiktions)
or (2) the AES-ID or terminal-ID contained in a
FITE 18 received ,from the interworking interface with the
terrestrial network (for ground-origina~ions).
4.8.5 Circuit-mode voice
encoding algorithm
All AES and GES implementations shall provide circuit-mode
voice communications using the voice encoding/decoding
algorithm defined in Appendix 7 to Chapter 4. All such voice
con~munications shall be conducted over a 21 kbitsls
C channel as defined in 4.4.5.
Note.- The requirements for mapping between interworking
telephony events and CM-LIDUs by the AES outgoing
and incoming procedures are defined in Appendix 5 to
Chapter 4, Figures A5-I to AS-I1 and A5-12 to AS-18, respectively.
Circuit-mode configuration parameters (e.g. those used
in 4.8.6.1.1.1) are defined in Appendix 6 to Chapter 4.
4.86 1 1 1 AES outgoing circuit-mode procedure.
Receipt of an "AMS(R)S call origination" event (FIE 18) at
the interworking interface shall cause AES circuit-mode
services to assign a unique application reference number to the
call. AES circuit-mode services shall then do the following:
a) if sufficient AES C channel resources are not available
and the blockage is attributable to calls operating at a
C channel priority equal to or greater than the current
Annex 10 - Aer~nautical Xelecommunications Volume ZIZ
call attempt, AES circuit-mode services shall return a
"call unsuccessful - network congestion" event
(BITE 12) to the interworking interface and terminate
all activities for the call; or
b) if sufficient C channel resources are available or if at
least one of the calls causing the blockage is operating
at a C channel priority less than -the current call
attempt, AES circuit-mode services shall do the
following and then await a C channel assignment from
GES circuit-mode services:
1) if the call priority is distress/urgency, AES circuitmode
services shall forward to the link layer nA21
"abbreviated access request - telephone" CMLIDUs:
or
2) if the call priority is flight safety, A.ES circuitmode
sewices shall forward to the link layer nA22
"abbreviated access request - telephone" CMLDUs;
or
3) if the call priority is regularity/rneteorological, the
　
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